1 Year CD Rate Calculator

The 12 month maturity, step by step

A one year certificate of deposit exchanges a locked rate and a set length for a payout you can calculate before you sign. The maturity value follows the compound interest formula A = P x (1 + r/n)^(n x t), where P is the deposit, r is the nominal annual rate as a decimal, n is the tally of compounding periods each year and t is the length, with 1 standing for a full year. Over exactly one year, t is 1 and the exponent is n.

Push the demonstration rate through it. Place $10,000 into a CD quoted at 4.25% APY with annual compounding and the whole calculation is one multiplication: 10,000 x 1.0425 = 10,425.00. The interest is $425.00, and the APY tells you that directly, because an APY is defined as the overall growth over one year, not a rate awaiting conversion.

That is the number to shop with. Banks publish both a rate and an APY, and federal Truth in Savings rules require the APY in the disclosure so that a 4.25% rate compounded monthly can be lined up against a 4.35% rate compounded annually. The CFPB's CD explainer puts it plainly: when you shop, compare the length, the rate you earn, and the penalty for pulling money out early. The panel above handles all three, and the 4.25% APY it opens at is a demonstration figure, not a quote from any bank.

A note on minimums and tiers before the arithmetic. Plenty of certificates set a floor, commonly $500 or $1,000, and some post a richer APY above a higher threshold; a handful command six digit sums for the headline tier. Because the APY is the comparable figure, a tiered quote should always be keyed at the tier your deposit genuinely reaches, not at the advertised peak. Credit unions may likewise mandate membership eligibility, a savings suffix account, or a modest one time enrollment expense, none of which shows up in the yield but all of which count in the decision.

APY against the nominal rate: one number, two contracts

The same figure, 4.25%, describes two distinct CDs depending on whether the bank labels it an APY or a nominal rate. An APY already contains the compounding, so a 4.25% APY yields $425.00 on $10,000 regardless of the method used to compute it. A 4.25% nominal rate is a raw input, and the cadence governs what it resolves to. Compounded monthly it comes to 4.25 / 12 = 0.354167 a month, and the year closes at 10,433.38, which is an APY of 4.3338%.

The panel handles both readings. Feed it 4.25 as an APY and it reports a maturity of $10,425.00 and a nominal rate of 4.2500% for the annual cadence. Feed it 4.25 as a nominal rate with monthly compounding and it reports $10,433.38. The two entries are 4.25 / 100 = 0.0425 apart in meaning, and over a year the gap in money is $8.38 on a $10,000 deposit.

The lower row is the one that catches shoppers. A 4.25% APY compounded monthly is not better than a 4.25% APY compounded annually; both deliver $10,425.00, because the APY is the end of the calculation, not the opening of it. The bank reaches the same payout with a slimmer nominal rate, 4.1694% in place of 4.25%. When two offers quote divergent labels, convert both to APY before deciding.

Where one year CD rates stood in late 2026

Shopping rates move with the Federal Reserve cycle, and the anchor for judging any quote is the FDIC national rate, a deposit weighted average across all insured institutions and credit unions. Because big branch banks hold most of the deposits and offer close to nothing, the national average sits an ocean below what online banks and credit unions tout. The FDIC published a national rate of 1.78% for 12 month CDs in March 2025 and 1.76% as of October 19, 2026, so advertised one year yields that post three points or so above the average are quotes from the competitive end of the market, not the middle.

Spanning the average and the strongest quotes sits most of the market, and the gaps are useful to know before you settle for the opening bid in town. Credit unions market the same product as a share certificate, in most cases under their own NCUA insurance, and their boards fix pricing independently of bank marketing. Brokered CDs, sold through investment firms, not opened at a bank, sometimes carry higher yields because the broker negotiates in bulk, although the investor.gov primer warns that deposit brokers are not licensed or certified and that the buyer should research the issuer. Callable CDs carry a premium yield in exchange for the bank's privilege to redeem the deposit early, which inverts the usual logic: the caller gets the option, not you. Step-up and bump rate schemes raise the APY in steps, and jumbo tiers give more above a minimum, now and then six digit sums.

Each variation changes what the panel should be fed. A callable CD's headline APY is only locked till the call date, so the one year maturity it prints is the best case, not the promise. A step-up structure renders the year's blended yield an average of two rates, and the blended figure belongs in the rate field. None of these variants is dishonest; each just moves the risk somewhere the headline number does not show.

Read the table as a shape, not a buying list. The curve is flat to inverted across CD lengths at the average, and a 12 month deposit delivers more than a three year one, which tells you the market expects short rates to fall. The Treasury datapoint is the yield on obligations of similar maturity that the FDIC leans on for its rate ceiling reckoning, and a 4.54% yield on 12 month Treasury paper against a 1.76% average CD rate is a reminder that the average includes a lengthy tail of offers close to nothing.

Regardless of the calendar's reading when you read this, run the current FDIC table and two or three live quotes through the panel before locking money for a year. A rate quoted months ago is not a rate.

Compounding frequency and the monthly gap

Compounding frequency is how frequently earned interest starts collecting interest of its own. Annual compounding posts interest a solitary time, at maturity. Monthly compounding posts interest on twelve occasions, and each credit boosts the sum that the following month's interest is computed on. The consequence over one year is genuine but slight, and it tapers as the rate slides.

At the demonstration rate the whole ladder amounts to single dollars. Monthly compounding beats annual by 10,433.38 - 10,425.00 = 8.38 on a $10,000 deposit. Quarterly compounding beats annual by 10,431.82 - 10,425.00 = 6.82, and daily compounding beats annual by 10,434.13 - 10,425.00 = 9.13. Quarterly lands $1.56 below monthly, which is the whole spread separating the two cadences on this deposit. The daily figure sits less than a dollar above the monthly one, and that gap explains the silence around daily compounding in bank marketing: beyond monthly, any additional frequency contributes nearly nil.

Two working readings follow. Begin with one bank offering 4.25% nominal compounded monthly and another offering 4.35% APY: the rival wins, because 4.3338% loses to 4.35% only on paper labels and the rival quote is higher with both expressed as yields. Next, crediting is not the same as compounding: some CDs compute interest daily but hold it and credit it at maturity, so the disclosure line about when interest is credited matters. The SEC's CD primer on investor.gov points out that the disclosure statement should disclose when the bank credits interest, such as monthly or semiannually, and the panel above models the compounding frequency you select, not a preset one.

Watch the crediting fine print besides. A handful of certificates compute earnings daily but only post them quarterly, and a handful suspend earnings entirely after a withdrawal request till the account closes. Where the earned but unposted interest rests matters if the institution fails midstream, because the insurance ceiling caps the posted sum. None of this changes the panel inputs, yet each quirk shifts the real outcome a couple of dollars in one direction or the other.

Early withdrawal penalties and the break even month

Penalties are the reason the one year commitment has teeth. The most widespread bank custom converts the penalty into a number of months of interest, frequently 3 months on a length of a year or less, computed as simple interest on the deposit: 10,000 x 0.0425 x 3 / 12 = 106.25. Some banks deploy sliding scales, some claw back from the deposit, and a minority top the interest earned, so the executed disclosure controls. The CFPB notes that withdrawing early means owing a penalty fee and tells shoppers to compare the penalty size between offers, because the designs differ.

Set the panel's penalty field to 3 and move the withdrawal month. The interest earned grows as the months pass while the penalty holds flat, so there is a break even point where the two cross. At this rate and deposit it occurs just outside 3 months, and the table lays out what each exit surrenders.

The opening three rows are the costliest. Pull out at 1 month and the CD returns 34.74 - 106.25 = -71.51 of net interest, meaning the bank claws back the shortfall from the deposit and you walk away with $9,928.49, less than you deposited, for the privilege of dipping into personal money for a month. At 3 months the net sits at -$1.65. Only from about the fourth month can the withdrawal outdo a parking spot that earned nothing, and by 6 months $104.04 of interest survives the penalty. Run the same exit on a monthly rhythm and the interest earned is $214.39, the penalty holds at $106.25, so $214.39 - $106.25 = $108.14 survives and you walk away with $10,108.14.

Before opening the CD, decide what the money is for. If there is any chance you might want it within a year, a no penalty CD or a savings account at a lower APY beats a penalized exit in most cases, and the panel's penalty field set to your bank's actual design will reveal the divergence in money.

One more wrinkle: partial withdrawals. Some institutions permit taking the posted earnings out midstream while leaving the deposit untouched, with no charge; others read any withdrawal as a complete redemption and apply the entire penalty to the entire sum. If your bank allows an earnings only draw, the panel can be exercised twice, once with the deposit left alone and once with the deposit reset, to bound the outcome. Probe before you open the account, because the answer is rarely printed on the rate sheet.

The $250,000 insurance line and splitting a large deposit

Federally insured CDs are backed by a government promise few investments can equal. The FDIC deposit insurance material reports that deposits are automatically insured to at least $250,000 at each FDIC insured bank, and the investor.gov primer adds the detail that matters: the $250,000 spans all accounts in your name at the same bank, not each CD you hold there. A $420,000 two year CD at one bank strands $170,000 exposed if that bank fails; the same $420,000 as two $210,000 CDs at two banks is sheltered at both.

Registration categories open headroom. An individual account counts against one $250,000 ceiling, a joint account is insured at $250,000 for each joint holder, and retirement accounts, trusts and Payable on Death registrations each come with their own handling under FDIC regulations. Credit unions mirror the structure through NCUA insurance at the same $250,000 standard. A couple with $600,000 in CDs can hold $250,000 in each of their individual names at one bank, $250,000 in the joint account at a distinct bank, and stay inside the ceilings and avoid opening a third relationship.

Companies and large households have one more tool: network sweep arrangements, in which a bank or a network splits a deposit across many insured institutions so the entire sum stays under the ceiling at each one. The mechanics trade convenience for coverage, as a swept deposit may be harder to recall on short notice, and the intermediary takes a slice of the yield. For most individual savers, opening two or three direct relationships and keeping each under the ceiling is the simpler route, and the FDIC's own BankFind tool verifies that a specific institution is insured before the transfer goes out.

Watch the interest besides. A CD that matures at $252,000 from a $250,000 deposit spends a slice of its existence over the ceiling, and a renewal that rolls the entire proceeds onward compounds the problem. Keeping each bank relationship slightly under the ceiling leaves room for growth and for the bank's own ledger quirks.

At maturity: renewal, the grace window and the Treasury alternative

Most CDs renew automatically. When the 12 months end, the bank rolls the deposit into a fresh CD of the same length at the rate in force then, and gives a grace window, typically a handful of weekdays set by the disclosure, in which you can add money, move the money out, or change the length at no penalty. Mark the maturity date. A CD that renews at a rate you did not agree to is a common and avoidable outcome, and the fix is a calendar alert about a week before maturity.

The reinvestment problem is the structural risk of a one year commitment. You accepted a locked rate for a year, and when the year ends the going rate is whatever the market then grants. The FDIC table shows the shape of that risk in late 2026: 12 month paper at a 1.76% national average while the 12 month Treasury yield sat at 4.54%, meaning a buyer of the average CD was accepting a wide spread to lock the same short horizon.

Levies and inflation ride on top of each CD payout and count in the deliberation equally. Interest on a bank CD is taxed at ordinary rates in the year it is credited, whether or not you touch it, and the bank reports it on a 1099-INT; a buyer in a high bracket retains measurably less than the APY suggests, which narrows the gap to the Treasury bill that escapes state levies. Inflation pushes the same direction. A 4.25% APY against 3% inflation preserves buying power; a 1.76% average rate against the same inflation does not, and twelve months is plenty of time for that gap to register on a six figure deposit. Neither force changes the arithmetic in the panel, but both change whether the maturity value at the close of the year fetches what the deposit fetched at the outset.

The TreasuryDirect bills page catalogs 52 week bills among the lengths available, sold in $100 increments at a discount and redeemed at face value at maturity, with interest owed federally and exempt from state and local levies. That final line translates into actual points in states with high levies, and bills can be sold before maturity at market value in place of a fixed penalty. A CD competes on a rate you can lock and insurance you can verify; the bill competes on the levy line and the exit. Which wins depends on the two live quotes, and both are one division away from the panel's APY output.

Reading the disclosure before you sign

Everything that bites later lives in the disclosure, and each line maps to a field in the panel. Audit the seven items against the paperwork before money moves.

Rate and APY. Both should appear, and the APY is the comparable number. If a quoted APY looks out of line with the rate and the disclosed compounding, ask how it was computed.

Compounding and crediting. How frequently interest compounds, and when it is credited, are two distinct items. Daily compounding with crediting only at maturity behaves differently from monthly crediting you can withdraw.

Maturity date. The exact date the length ends and the auto renewal kicks in, which is also the date your date reminder points at.

Penalty design. The count of months of interest, whether it can surpass interest earned, and whether the bank claws back from the deposit. Feed the actual design into the penalty field, not an assumed 3.

Grace period. How many days after maturity you have to move or change the money, and whether interest accrues across those days.

Minimum deposit and tiering. Some APYs bind only past a threshold, and a $9,750 deposit can earn a divergent rate from a $10,750 one.

Renewal rate mechanics. Whether the renewal draws on the bank's prevailing rate for the same length and whether you are notified in advance. This article does arithmetic on any rate you supply; it is not counsel on any specific product, and the disclosure outranks each table here.

A closing habit to build: secure the quoted yield in ink, with the compounding wording, before the money leaves your hands. Screenshots age badly, branches rotate staff, and the executed disclosure is the only document that governs. If the paperwork disagrees with the quote, the discrepancy is easy to raise at the outset and painful to raise at redemption.